LG 22LH200C User manual

LCD TV
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : LA92A
MODEL : 22LH200C 22LH200C-UA
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
Internal Use Only
Printed in KoreaP/NO : MFL58436021 (0906-REV00)

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Only for training and service purposes - 2 -
CONTENTS
CONTENTS ............................................................................................. 2
PRODUCT SAFETY ................................................................................. 3
SPECIFICATION....................................................................................... 6
ADJUSTMENT INSTRUCTION ................................................................ 9
TROUBLE SHOOTING .......................................................................... 14
BLOCK DIAGRAM.................................................................................. 20
EXPLODED VIEW .................................................................................. 21
SVC. SHEET ...............................................................................................

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Only for training and service purposes - 3 -
SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the
Schematic Diagram and Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩand 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
1.5 Kohm/10W
To Instrument’s
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF

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Only for training and service purposes - 4 -
CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety precautions on
page 3 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an
explosion hazard.
2. Test high voltage only by measuring it with an appropriate high
voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specified otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10% (by volume) Acetone and 90% (by
volume) isopropyl alcohol (90%-99% strength)
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication of
contacts in not required.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks are
correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to any
heat sink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged easily
by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistors and
semiconductor "chip" components. The following techniques
should be used to help reduce the incidence of component
damage caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed to
prevent potential shock reasons prior to applying power to the
unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
devices.
4. Use only an anti-static type solder removal device. Some solder
removal devices not classified as "anti-static" can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum foil
or comparable conductive material).
7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
CAUTION: Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion such as
the brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity
sufficient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate
tip size and shape that will maintain tip temperature within the
range or 500°F to 600°F.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500°F to 600°F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500°F to 600°F)
b. First, hold the soldering iron tip and solder the strand against
the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.
SERVICING PRECAUTIONS

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IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.

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Only for training and service purposes - 6 -
4. General Specification(TV)
No. Item Specification Remark
1. Receiving System ATSC/ NTSC-M
2. Available Channel 1) VHF : 02~13
2) UHF : 14~69
3) DTV : 02-69
4) CATV : 01~135
5) CADTV : 01~135
3. Input Voltage 1) 100- 240V~, 50/60Hz Mark : 110V, 60Hz
4. Market NORTH AMERICA
5. Screen Size 22 inch Wide (1366 x 768)
6. Aspect Ratio 16:9
7. Tuning System FS
8. LCD Module LC220WXE-TBA1
9. Operating Environment 1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10. Storage Environment 1) Temp : -20 ~ 60 deg
2) Humidity : 0 ~ 85 %
1. Application Range
This specification sheet is applied to the LCD TV used LA92A
chassis.
2. Specification
Each part is tested as below without special appointment
1) Temperature : 25 ± 5°C (77 ± 9ºF), CST : 40 ± 5ºC
2) Relative Humidity : 65 ±10%
3) Power Voltage : Standard input voltage
(100-240V@ 50/60Hz)
* Standard Voltage of each products is marked by models
4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
5) The receiver must be operated for about 20 minutes prior to
the adjustment.
3. Test method
1) Performance : LGE TV test method followed.
2) Demanded other specification
- Safety : UL, CSA, IEC specification
- EMC : FCC, ICE, IEC specification
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement .

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5. Chroma & Brightness
No Item Min. Typ. Max. Unit Remark
1 Max Luminance 280 350 cd/m2
(Center 1-point / Full White Pattern)
2 White average brightness cd/m2N/A
3 Luminance uniformity 77 % Full white
4 Color coordinate RED X 0.642 ± 0.03
Y 0.333 ± 0.03
GREEN X 0.295 ± 0.03
Y 0.608 ± 0.03
BLUE X 0.147 ± 0.03
Y 0.063 ± 0.03
WHITE X 0.285 ± 0.03
Y 0.293 ± 0.03
6 Contrast ratio 700:1 1000:1
6000:1 8000:1(DCR)
7 Color Temperature Cool 0.283 0.285 0.287 ** The W/B Tolerance is
0.291 0.293 0.295 ±0.015 for Adjustment
Medium 0.293 0.295 0.297
0.303 0.305 0.307
Warm 0.311 0.313 0.315
0.327 0.329 0.331
6. Component Video Input (Y, CB/PB, CR/PR)
No. Specification Remark
Resolution H-freq(kHz) V-freq(Hz) Pixel clock
1. 720*480 15.73 60 13.5135 SDTV ,DVD 480I
2. 720*480 15.73 59.94 13.5 SDTV ,DVD 480I
3. 720*480 31.50 60 27.027 SDTV 480P
4. 720*480 31.47 59.94 27.0 SDTV 480P
5. 1280*720 45.00 60.00 74.25 HDTV 720P
6. 1280*720 44.96 59.94 74.176 HDTV 720P
7. 1920*1080 33.75 60.00 74.25 HDTV 1080I
8. 1920*1080 33.72 59.94 74.176 HDTV 1080I
9. 1920*1080 67.500 60 148.50 HDTV 1080P
10. 1920*1080 67.432 59.939 148.352 HDTV 1080P
11. 1920*1080 27.000 24.000 74.25 HDTV 1080P
12. 1920*1080 26.97 23.976 74.176 HDTV 1080P
13. 1920*1080 33.75 30.000 74.25 HDTV 1080P
14. 1920*1080 33.71 29.97 74.176 HDTV 1080P

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No. Specification Remark
Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz)
PC DDC
1 640*350 31.469 70.08 25.17 DOS X
2 720*400 31.469 70.08 28.32 DOS O
3 640*480 31.469 59.94 25.17 VESA(VGA) O
4 800*600 37.879 60.31 40.00 VESA(SVGA) O
5 1024*768 48.363 60.00 65.00 VESA(XGA) O
6 1280*768 47.776 59.87 79.50 CVT(WXGA) X
7 1360*768 47.720 59.799 84.75 CVT(WXGA) O
8 1366*768 47.13 59.65 72 X
7. RGB input (PC)
8. HDMI input (PC/DTV)
No. Resolution H-freq(kHz) V-freq(Hz) Pixel clock(MHz) Remark
PC DDC
1. 640*350 31.469 70.08 25.17 EGA X
2. 720*400 31.469 70.08 28.32 DOS O
3. 640*480 31.469 59.94 25.17 VESA(VGA) O
4. 720*400 37.879 60.31 40.00 VESA(SVGA) O
5. 1024*768 48.363 60.00 65.00 VESA(XGA) O
6. 1280*768 47.776 59.87 79.50 CVT(WXGA) O
7. 1360*768 47.720 59.799 84.75 CVT(WXGA) O
DTV
1 720*480 31.5 60 27.027 SDTV 480P
2 720*480 31.47 59.94 27.00 SDTV 480P
3 1280*720 45.00 60.00 74.25 HDTV 720P
4 1280*720 44.96 59.94 74.176 HDTV 720P
5 1920*1080 33.75 60.00 74.25 HDTV 1080I
6 1920*1080 33.72 59.94 74.176 HDTV 1080I
7 1920*1080 67.500 60 148.50 HDTV 1080P
8 1920*1080 67.432 59.939 148.352 HDTV 1080P
9 1920*1080 27.000 24.000 74.25 HDTV 1080P
10 1920*1080 26.97 23.976 74.176 HDTV 1080P
11 1920*1080 33.75 30.000 74.25 HDTV 1080P
12 1920*1080 33.71 29.97 74.176 HDTV 1080P

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
1. Application Object
This specification sheet applied to LA92A Chassis applied
LCD TV all models manufactured in TV factory.
2. Notes
(1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer. However, the use of isolation
transformer will help protect test equipment.
(2) Adjustments must be done in the correct order.
(3) The adjustments must be performed in the circumstance of
20±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
(4) The input voltage of the receiver be must kept 100V-240V,
50/60Hz when adjusting.
(5) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
15.
In case of keeping module is in the circumstance of 0°C, it
should be placed in the circumstance of above 15°C for 2
hours
In case of keeping module is in the circumstance of below -
20°C, it should be placed in the circumstance of above
15°C for 3 hours,.
Caution : When still image is displayed for a period of 20
minutes or longer (especially where W/B scale is strong.
Digital pattern 13ch and/or Cross hatch pattern 09ch),
there can some afterimage in the black level area.
3. Adjustment items
3.1. Main PCB check process
- Adjust 480i Comp1
- Adjust 1024*768 RGB
Above adjustment items can be also performed in Final
Assembly if needed. Both Board-level and Final assembly
adjustment items can be check using In-Star Menu 1.ADJUST
CHECK.
3.2. Final assembly adjustment
- EDID/DDC download
- White Balance adjustment
- RS-232C functionality check
- Factory Option setting per destination
- Ship-out mode setting (In-Stop)
3.3 Etc
- Ship-out mode
- Service Option Default
- USB Download(S/W Update, Option, Service only)
- ISP Download(Option)
4. Automatic Adjustment
4.1. ADC Adjustment
(1) Overview
ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate
RGB deviation.
(2) Equipment & Condition
1) Jig (RS-232C protocol)
2) MSPG-925 Series Pattern Generator(MSPG-925FA)
- Resolution : 480i Comp1 (MSPG-925FA: model-209,
pattern-65)
1024*768 RGB (MSPG-925FA: model-60 , pattern-65)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
- Image
(3) Adjustment
1) Adjustment method
- Using RS-232, adjust items listed in 3.1 in the other
shown in “4.1.3.3”
2) Adj. protocol
Ref.) ADC Adj. RS232C Protocol_Ver1.0
3) Adj. order
- aa 00 00 [Enter ADC adj. mode]
- xb 00 40 [Change input source to Component1(480i)]
- ad 00 10 [Adjust 480i Comp1]
- xb 00 60 [Change input source to RGB(1024*768)]
- ad 00 10 [Adjust 1024*768 RGB]
- ad 00 90 End adj.
- 9 -
ADJUSTMENT INSTRUCTION
Protocol Command Set ACK
Enter adj. mode aa 00 00 a 00 OK00x
Source change xb 00 40 b 00 OK40x (Adjust 480i Comp1 )
xb 00 60 b 00 OK60x (Adjust 1024*768 RGB)
Begin adj. ad 00 10
Return adj. result OKx (Case of Success)
NGx (Case of Fail)
Read adj. data (main) (main)
ad 00 20 000000000000000000000000007c007b006dx
(sub) (Sub)
ad 00 21 000000070000000000000000007c00830077x
Confirm adj. ad 00 99 NG 03 00x (Fail)
NG 03 01x (Fail)
NG 03 02x (Fail)
OK 03 03x (Success)
End adj. aa 00 90 a 00 OK90x

(2) Confirmation
1) We confirm whether “0xBF(480i)/0xC8(1080i)” address
of EEPROM “0xA2” is “0xAA” or not.
2) If “0xBF(480i)/0xC8(1080i)” address of EEPROM “0xA2”
isn’t “0xAA”, we adjust once more.
3) We can confirm the ADC values from “0xB ~0xBE(480i)/
0xC2~(1080i)” addresses in a page “0xA2”.
* Manual ADC Confirmation using Service Remocon. After
enter Service Mode by pushing “INSTART” key.
5. Manual Adjustment
5.1. ADC(Saturn5) Adjustment
(1) Overview
ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate
RGB deviation.
(2) Equipment & Condition
1) Adjust Remocon
2) 801GF(802B, 802F, 802R) or MSPG925FA Pattern
Generator
- Resolution: 480i, 1024*768
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level: 0.7±0.1 Vp-p
- Image
3) Must use standard cable
(3) Adjust method
• ADC 480i Comp1
1) Check connected condition of Comp1 cable to the
equipment
2) Give a 480i Mode, Horizontal 100% Color Bar Pattern
to Comp1.
(MSPG-925FA Ë Model: 209, Pattern: 65)
3) Change input mode as Component1 and picture mode
as “Standard”
4) Press the In-start Key on the ADJ remote after at least
1 min of signal reception. Then, select 7. External ADC
-> 1. COMP 480i on the menu. Press enter key. The
adjustment will start automatically.
5) If ADC calibration is successful, “ADC RGB Success”
is displayed.
If ADC calibration is failure, “ADC RGB Fail” is
displayed.
6) If ADC calibration is failure, after recheck ADC pattern
or condition retry calibration. Error message refer to (v)
• ADC 1024*768 RGB
1) Check connected condition of Component & RGB
cable to the equipment
2) Give a 1024*768 Mode, 100% Horizontal Color Bar
Pattern to RGB port.
(MSPG-925 Series Ë model:60 , pattern:65 )
3) Change input mode as RGB and picture mode as
“Standard”
4) Press the In-start Key on the ADJ remote after at least
1 min of signal reception. Then, select 7. External ADC
-> 1. COMP 480i on the menu. Press enter key. The
adjustment will start automatically.
5) If ADC calibration is successful, “ADC RGB Success”
is displayed.
If ADC calibration is failure, “ADC RGB Fail” is
displayed.
6) If ADC calibration is failure, after recheck ADC pattern
or condition retry calibration
Error message refer to 5)
5.2. EDID(The Extended Display Identification
Data)/DDC(Display Data Channel) download
Reference : Download is only possible in POWER ONLY
MODE
(1) Overview
It is a VESA regulation. A PC or a MNT will display an
optimal resolution through information sharing without any
necessity of user input. It is a realization of “Plug and Play”.
(2) Equipment
- Since embedded EDID data is used, EDID download JIG,
HDMI cable and D-sub cable are not need.
- Adjust remocon
(3)Download method
1) Press Adj. key on the Adj. R/C,
2) Select EDID D/L menu.
3) By pressing Enter key, EDID download will begin
4)If Download is successful, OK is display, but If
Download is failure, NG is displayed.
5) If Download is failure, Re-try download.
Caution) When EDID download, must remove RGB/HDMI cable.
- 10 - LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes

(4) EDID DATA
1) HDMI 1 [C/S: XXEF]
- EDID Block 0 table =
- EDID Block 1 table =
2) HDMI 2 [C/S: XXDF]
- EDID Block 0 table =
- EDID Block 1 table =
3) RGB [C/S: XX]
- EDID Block 0 table =
* Address 10/11 and 7F means Manufacture Week and
Checksum. So this data will be change.
5.3. White Balance Adjustment
(1) Overview
• W/B adj. Objective & How-it-works
- Objective: To reduce each Panel’s W/B deviation
- How-it-works: When R/G/B gain in the OSD is at 192, it
means the panel is at its Full Dynamic
Range. In order to prevent saturation of
Full Dynamic range and data, one of
R/G/B is fixed at 192, and the other two is
lowered to find the desired value.
- Adj. condition : normal temperature
1) Surrounding Temperature: 25±5ºC
2) Warm-up time: About 5 Min
3) Surrounding Humidity: 20% ~ 80%
(2) Equipment
1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12)
2) Adj. Computer(During auto adj., RS-232C protocol is
needed)
3) Adjust Remocon
4) Video Signal Generator MSPG-925F 720p/216-Gray
(Model:217, Pattern:78)
-> Only when internal pattern is not available
• Color Analyzer Matrix should be calibrated using CS-1000
(3) Equipment connection MAP
(4) Adj. Command (Protocol)
1) RS-232C Command used during auto-adj.
Ex) wb 00 00 -> Begin white balance auto-adj.
wb 00 10 -> Gain adj.
ja 00 ff -> Adj. data
jb 00 c0
...
...
wb 00 1f -> Gain adj. complete
*(wb 00 20(start), wb 00 2f(end)) -> Off-set adj.
wb 00 ff -> End white balance auto adj.
- 11 - LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
012 34 5 67 8 9ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 XX XX 01 03 80 73 41 78 0A CF 74 A3 57 4C B0 23
20 09 48 4C A1 08 00 81 C0 01 01 01 01 01 01 01 01
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 7E 8A 42 00 00 1E 01 1D 00 72 51 D0 1E 20
50 6E 28 55 00 7E 8A 42 00 00 1E 00 00 00 FD 00 39
60 3F 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 XX
01234 5 67 8 9ABCDEF
002031FF1471022200584030226150750
10 09 07 07 67 03 0C 00 10 00 B8 2D E3 05 03 01 02
20 3A 80 18 71 38 2D 40 58 2C 04 05 7E 8A 42 00 00
30 1E 01 1D 80 18 71 1C 16 20 58 2C 25 00 7E 8A 42
40 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 7E
50 8A 42 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96
60 00 7E 8A 42 00 00 18 26 36 80 A0 70 38 1F 40 30
70 20 25 00 7E 8A 42 00 00 1A 00 00 00 00 00 00 FF
01234 5 67 8 9ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 XX XX 01 03 80 73 41 78 0A CF 74 A3 57 4C B0 23
20 09 48 4C A1 08 00 81 C0 01 01 01 01 01 01 01 01
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 7E 8A 42 00 00 1E 01 1D 00 72 51 D0 1E 20
50 6E 28 55 00 7E 8A 42 00 00 1E 00 00 00 FD 00 39
60 3F 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 01 XX
01234 5 67 8 9ABCDEF
002031FF1471005840302070626150750
10 09 07 07 6B 03 0C 00 20 00 B8 2D E3 05 03 01 02
20 3A 80 18 71 38 2D 40 58 2C 04 05 7E 8A 42 00 00
30 1E 01 1D 80 18 71 1C 16 20 58 2C 25 00 7E 8A 42
40 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00 7E
50 8A 42 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E 96
60 00 7E 8A 42 00 00 18 26 36 80 A0 70 38 1B 40 30
70 20 25 00 7E 8A 42 00 00 1A 00 00 00 00 00 00 EF
01234 5 67 8 9ABCDEF
000FFFFFFFFFFFF001E6D010001010101
10 XX XX 01 03 68 73 41 78 0A CF 30 A3 57 4C B0 23
20 09 50 4E A1 08 00 81 C0 01 01 01 01 01 00 01 01
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 7E 8A 42 00 00 1E 01 1D 00 72 51 D0 1E 20
50 6E 28 55 00 7E 8A 42 00 00 1E 00 00 00 FD 00 39
60 3F 1F 3C 09 00 0A 20 20 20 20 20 20 00 00 00 FC
70 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 00 XX
Color Analyzer
Computer
Pattern Generator
RS-232C
RS-232C
RS-232C
Probe
Signal Source
* If TV internal pattern is used, not needed
Connection Diagram of Automatic Adjustment
RS-232C COMMAND Meaning
[CMD ID DATA]
wb 00 00 Begin White Balance adj.
wb 00 ff End White Balance adj.(Internal pattern disappeared)

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
2) Adjustment Map
(5) Adj. method
•Auto adj. method
1) Set TV in adj. mode using POWER ON key
2) Zero calibrate probe then place it on the center of the
Display
3) Connect Cable(RS-232C)
4) Select mode in adj. Program and begin adj.
5) When adj. is complete (OK Sing), check adj. status pre
mode (Warm, Medium, Cool)
6) Remove probe and RS-232C cable to complete adj.
* W/B Adj. must begin as start command “wb 00 00”, and
finish as end command “wb 00 ff”, and Adj. offset if
need
•Manual adj. method
1) Set TV in Adj. mode using POWER ON
2) Zero Calibrate the probe of Color Analyzer, then place
it on the center of LCD module within 10cm of the
surface..
3) Press ADJ key -> EZ adjust using adj. R/C > 6. White-
Balance then press the cursor to the right (KEYG).
(When KEY(G) is pressed 216 Gray internal pattern
will be displayed)
4) One of R Gain / G Gain / B Gain should be fixed at
192, and the rest will be lowered to meet the desired
value.
5) Adj. is performed in COOL, MEDIUM, WARM 3 modes
of color temperature.
- If internal pattern is not available, use RF input. In EZ
Adj. menu 6.White Balance, you can select one of 2
Test-pattern: ON, OFF. Default is inner(ON). By
selecting OFF, you can adjust using RF signal in 216
Gray pattern.
* Adj. condition and cautionary items
1) Lighting condition in surrounding area
Surrounding lighting should be lower 10 lux. Try to
isolate adj. area into dark surrounding.
2) Probe location
- LCD: Color Analyzer (CA-210) probe should be
within 10cm and perpendicular of the module
surface (80°~ 100°)
3) Aging time
- After Aging Start, Keep the Power ON status during 5
Minutes.
- In case of LCD, Back-light on should be checked
using no signal or Full-white pattern.
(6) Reference (White Balance Adj. coordinate and color
temperature)
•Luminance: 216 Gray
•Standard color coordinate and temperature using CS-
1000 (over 26 inch)
•Standard color coordinate and temperature using CA-
210(CH 9)
5.4. HDCP SETTING
- HDCP setting is not necessary in Saturn5 model.
5.5 Option selection per country
(1) Overview
- Option selection is only done for models in Non-USA
North America due to rating
-Applied model: LA92A Chassis applied None USA
model(CANADA, MEXICO)
(2) Method
1) Press ADJ key on the Adj. R/C, then select Country
Group Menu
2) Depending on destination, select KR or US, then on the
lower Country option, select US, CA, MX. Selection is
done using +, - KEY
- 12 -
ITEM Command Data Range Default
(Hex.) (Decimal)
Cmd 1 Cmd 2 Min Max
Cool R-Gain j g 00 C0
G-Gain j h 00 C0
B-Gain j i 00 C0
R-Cut
G-Cut
B-Cut
Medium R-Gain j a 00 C0
G-Gain j b 00 C0
B-Gain j c 00 C0
R-Cut
G-Cut
B-Cut
Warm R-Gain j d 00 C0
G-Gain j e 00 C0
B-Gain j f 00 C0
R-Cut
G-Cut
Mode Color Coordination Temp ∆UV
xy
COOL 0.276 0.283 11000K 0.0000
MEDIUM 0.285 0.293 9300K 0.0000
WARM 0.313 0.329 6500K 0.0000
Mode Color Coordination Temp ∆UV
xy
COOL 0.276±0.002 0.283±0.002 11000K 0.0000
MEDIUM 0.285±0.002 0.293±0.002 9300K 0.0000
WARM 0.313+0.002 0.329±0.002 6500K 0.0000

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes - 13 -
5.6. Tool Option selection
•Method: Press Adj. key on the Adj. R/C, then select Tool
option.
5.7. Ship-out mode check (In-stop)
•After final inspection, press In-Stop key of the Adj. R/C and
check that the unit goes to Stand-by mode.
•After final inspection, Always turn on the Mechanical S/W.
6. GND and Internal Pressure check
6.1. Method
1) GND & Internal Pressure auto-check preparation
- Check that Power Cord is fully inserted to the SET.
(If loose, re-insert)
2) Perform GND & Internal Pressure auto-check
- Unit fully inserted Power cord, Antenna cable and A/V
arrive to the auto-check process.
- Connect D-terminal to AV JACK TESTER
- Auto CONTROLLER(GWS103-4) ON
- Perform GND TEST
- If NG, Buzzer will sound to inform the operator.
- If OK, changeover to I/P check automatically.
(Remove CORD, A/V form AV JACK BOX)
- Perform I/P test
- If NG, Buzzer will sound to inform the operator.
- If OK, Good lamp will lit up and the stopper will allow the
pallet to move on to next process.
6.2. Checkpoint
•TEST voltage
- GND: 1.5KV/min at 100mA
- SIGNAL: 3KV/min at 100mA
•TEST time: 1 second
•TEST POINT
- GND TEST = POWER CORD GND & SIGNAL CABLE
METAL GND
- Internal Pressure TEST = POWER CORD GND & LIVE &
NEUTRAL
•LEAKAGE CURRENT: At 0.5mArms
7. USB S/W Download (option)
(1) Put the USB Stick to the USB socket
(2) Automatically detecting update file in USB Stick
- If your downloaded program version in USB Stick is Low,
it didn’t work.
But your downloaded version is High, USB data is
automatically detecting
(3) Show the message “Copying files from memory”
(4) Updating is staring.
(5) Updating Completed, The TV will restart automatically
(6) If your TV is turned on, check your updated version and
Tool option. (explain the Tool option, next stage)
* If downloading version is more high than your TV have,
TV can lost all channel data. In this case, you have to
channel recover. if all channel data is cleared, you didn’t
have a DTV/ATV test on production line.
* After downloading, have to adjust TOOL OPTION again.
1) Push "IN-START" key in service remote controller.
2) Select "Tool Option 1" and Push “OK”button.
3) Punch in the number. (Each model has their number.)
Model Tool 1 Tool 2 Tool 3 Tool 4 Menu
32LH20 16449 1572 932 1024 2 HDMI, CAN Tuner

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes - 14 -
TROUBLESHOOTING
1. Power-up boot check
Check stand-by Voltage.
P700 8pin : +5V_ST
Check X100 clock
12MHz
Check Power connector.
and AC S/W on?
OK
No
OK
Check Multi Voltage.
P700 13pin : 12V, 18pin : *20V
*20V Voltage is dependent on model.
32/36LH20, 32LH30 => 24V
19/22LH20 => 15V(pin1 or 2)
Replace Power board.
Replace X100.
OK
Check Fuse.
OK
No
Check P700 PWR_ON.
2pin : 5V
OK
Re-download software.
No
OK
Check Q706 output level
5V Replace Q706
No
Replace Mstar(IC100) or Main board
OK
Replace Power board.
No
Check inverter control & error
P700 22pin : Low
P700 20pin : high
OK
Check Power board or Module.
No
Check Mstar LVDS output
R812, R813,..., R821
OK
Replace Mstar(IC100) or Main board.
No
Check IC704 output voltage
3.3V
OK
Replace IC704.
No

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes - 15 -
2. Digital TV Video
Check RF cable & Signal.
Check Tuner 5V Power
IC1001 4pin
OK
OK
Check Check Demodulator Input
Clock(X1005-25MHz)
Check IC1002.
Check IC1005(19”, 22”).
No
Check IF_P/N Signal
OK
Bad Tuner. Replace Tuner.
No
Replace X1005.
No
OK
Check Mstar LVDS output
R812, R813,..., R821
Check IC1004(LGDT) Output
- AR1070, AR1071
OK
Replace IC1004.
No
Replace Mstar(IC100) or Main board.
No
3. Analog TV Video
Check RF cable.
Check Tuner 5V Power.
IC1001 4pin
OK
Check CVBS signal.
TU1001 #19 Pin
Check IC1002.
Check IC1005(19”, 22”)
No
OK
Replace Tuner.
No
OK
Check Mstar LVDS output Replace Mstar(IC100) or Main board.
No

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes - 16 -
4. Component Video
Check Component Cable.
Check JK1200.
OK
Check input signal format.
Is it supported?
OK
Replace Jack.
No
OK
Check Mstar LVDS output Replace Mstar(IC100) or Main board.
No
5. RGB Video
Check RGB Cable conductors for
damage.
Check JK1204.
OK
OK
Check input signal format.
Is it supported?
OK
Check signal R/G/B/H/V-Sync
C113, C108, C114, R146, R149
Replace Jack.
No
Check EDID.
OK
Replace the defective IC or re-download EDID data
No
Check other set.
If no problem, check signal line.
No
OK
Check Mstar LVDS output Replace Mstar(IC100) or Main board.
No

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes - 17 -
6. AV Video
Check AV Cable for damage or open conductor.
Check JK1200(*JK1202).
OK
Check input signal format.
Is it supported?
OK
Replace Jack. *JK1202 is Side AV supported model
32/37/42/47LH30 Models
No
OK
Check Mstar LVDS output Replace Mstar(IC100) or Main board.
No
Check HDMI Cable conductors for
damage of open conductor.
Check JK500, 501, 502
OK
OK
Check input signal format.
Is it supported?
OK
Check EDID & EEPROM
IC500, 501, 502.
I2C Signal
Replace Jack.
No
Replace the defective IC or re-download
EDID data.
No
Check HDCP key NVRAM(IC105)
power & I2C Signal (#5, #6) Replace the defective IC.
No
OK
Check HDMI Signal Check other set.
If no problem, check signal line.
No Replace Main board. No
OK
7. HDMI Video
OK
Check Mstar LVDS output Replace Mstar(IC100) or Main board.
No

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes - 18 -
8. All Source Audio
Check Mstar I2S Output
R604, R605, R606
Check IC600 Power
*20V, 3.3V, 1.8V.
OK
OK
Make sure you can’t hear any audio.
OK
First check the TV SPEAKER Menu
(Menu > Sound > TV Speaker) Toggle the menu.
OK
Check Mstar AUDIO_MASTER_CLK
R603
OK
Check Connector & P600
Check Regulator IC601, IC704
No
Check signal line. Or replace IC100.
No
Replace Mstar(IC100) or Main board.
No
No
Check Output Signal P600 1, 2, 3, 4 pin.
OK
Replace NTP(Audio AMP)
IC500.
No
Replace connector if found to be damaged.
No
OK
Check speaker resistance
and connector damage. Replace speaker.
No
*20V Voltage is dependent on model.
32/36LH20, 32LH30 => 24V
19/22LH20 => 15V(pin1 or 2)

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes - 19 -
10. Analog TV Audio
Check RF Cable.
OK
Check SIF buffer signal. Check SIF Signal line.
No
OK
Check Tuner 5V Power
TU1001 4pin Check IC1002. Check IC1005(19”, 22”).
No Bad Tuner
Replace Tuner.
No
OK
Follow procedure All source audio
trouble shooting guide. Replace Mstar(IC100) or Main board.
No
9. Digital TV Audio
Check Tuner 5V Power
TU1001 4pin. Check IC1002. Check IC1005(19”, 22”)
No
OK
Check IF_P/N Signal. Bad Tuner. Replace Tuner
No
OK
Check Demodulator Input Clock(X1005). Replace X1005.
No
OK
Check IC400(LGDT) Output
-AR1070, AR1071 Replace IC400.
No
OK
Check Output Signal
P600 1, 2, 3, 4 pin Replace NTP(Audio AMP) IC500
No
OK
Check speaker resistance
and connector damage. Replace speaker.
No
OK
Check Connector & P600 Replace connector
if found to be damaged.
No

LGE Internal Use OnlyCopyright LG Electronics. Inc. All right reserved.
Only for training and service purposes - 20 -
BLOCK DIAGRAM
D-sub RGB
HDMI 1
Side AV CVBS, L/R
DDR2 (512Mbit)
Qimonda / Hynix
NAND Flash
(256Mb)
Digital Audio (Optic)
Digital AMP
NTP3100L
RS-232C (Ctrl./SVC) I2S
EEPROM
512Kb
RGB/H/V
Half-NIM Tuner
DDR_Data[0:15], DQS, DM... Addr.[ ], ctrl. data
MAX3232
Saturn5
(ATSC
US)
MPEG2
Linux
Scaler
Data [0...7]
IF +/-
SIF
TU_CVBS
Reset / IF_AGC... SDA/SCL_5V
JTAG
CLK,TDI,TDO,MS,RST
Addr[0...1], CS...
Audio L/R
Audio L/R (for RGB)
HDMI 2
SPDIF
RX/TX RX/TX
JACK PACK
at REAR
JACK PACK
at SIDE
SCL, SDA_3.3V
TR Buffer
VSB
Demod.
LGDT3305
X-tal Reset Switch
Reset IC
12MHz
TS In[0...7] TS_clk, SOP, Val
EEPROM
Data[16:31]
DDR2 (512Mbit)
Qimonda / Hynix
AV
Component 1 Y Pb Pr, L/R
CVBS, Y/C, L/R
SCL, SDA_3.3V
Bluetooth
Dongle
(Option)
DP/DM
LCD Module
(FHD,HD)
LVDS
EEPROM EEPROM
HDMI 3 EEPROM